Around the mid-19th or early-20th century, before the adoption of Standard Time zones, cities and towns used their own local time which was usually based on solar noon of their location. This caused major complications for the railroad companies when making arrival and departure timetables because each town had its own local time which was different from other nearby towns. To ease all the scheduling problems, they created time zones for large areas and set all the local times the same. They did this by making all the clocks in that area (the time zone) have their time offset from Greenwich Mean Time (GMT) be the same as all other towns and cities in the same time zone. The time offset was usually an hour multiple, e.g. +2:00 or -5:00, but a few areas use a fractional part of an hour, such as Newfoundland, Canada at -3:30 and Kathmandu, Nepal at +5:45. These time zones were later adjusted, officially named, and set into law—or adopted—by the government of the country. Most countries or regions have not changed their time offset since then, but many have.
A few smaller areas have chosen their own time offset and daylight saving time (DST) Rules that differ from the geographical or political division that they border or are contained in. For example, the state of Quintana Roo in Mexico has differed from their country and neighboring state’s time offset and DST observance a few times—in 2015 they moved their time offset to -5:00 and stopped observing Mexican DST.
Using the Time Zones defined on this page will allow the calendar to adjust for both Time Offsets and DST rules that vary over time. Our predefined locations, for applicable regions, will have this Time Zone set or you can choose it on the custom page. When a calendar is generated using a rule on this page, it will be shown along with the latitude and longitude information in the header, e.g. Time Zone: America/Cancun. (You must select the “Latitude, longitude and time info” checkbox to see this.)
Our DST page details the DST rules we use during calendar creation—this page documents the more complicated situations.
On this site, we consider GMT and UTC (Coordinated Universal Time) synonymous.
The Time Zone rules have been researched using the IANA time zone tables, Wikipedia, newspaper or other published articles on the internet, or information from the country or city’s website. While there are many more zones defined in the IANA tables, use only the Times Zones listed on this page. Using Time Zones not on this page will be ignored by the code generating the calendar.
The future dates of the time offset and DST observance are set by the government of the country or locality and are subject to change. Also see FAQs and DST adjustments.
The rules on this page will supercede the basic DST rules documented on our DST rules page for all the years from the adoption of the time offset to the year 2099.
The tables below give each zone’s current time offset and DST rule. Zones that have changed at least once carry a full history link to our Time Zone Histories page.
For corrections or to have a new time zone added, please contact us.
Afghanistan
| Area | Time Zone | Offset | DST Rule |
| All full history | Asia/Kabul | +4:30 | none |
Africa – Ceuta & Melilla (Spanish autonomous cities)
| City | Time Zone | Offset | DST Rule |
| Ceuta | Africa/Ceuta | +1:00 | Europe |
| Melilla |
Australia – New South Wales & Australian Capital Territory (ACT)
| Area | Time Zone | Offset | DST Rule |
| All, except Broken Hill & Lord Howe Island | Australia/Sydney | +10:00 | Australia |
| Broken Hill | Australia/Broken_Hill | +9:30 | Australia |
| Lord Howe Island | Australia/Lord_Howe | +10:30 | Australia / Lord Howe |
Australia – Northern Territory
| Area | Time Zone | Offset | DST Rule |
| All | Australia/Darwin | +9:30 | none |
Australia – Queensland
| Area | Time Zone | Offset | DST Rule |
| All, except Whitsunday & Lindeman Island Groups | Australia/Brisbane | +10:00 | none |
| Whitsunday & Lindeman Island Groups | Australia/Lindeman | +10:00 | none |
Australia – South Australia
| Area | Time Zone | Offset | DST Rule |
| All, except Border Village | Australia/Adelaide | +9:30 | Australia |
| Border Village | Australia/Eucla | +8:45 | none |
Australia – Tasmania
| Area | Time Zone | Offset | DST Rule |
| All, except King Island | Australia/Hobart | +10:00 | Australia |
| King Island | Australia/Currie | +10:00 | Australia |
Australia – Victoria
| Area | Time Zone | Offset | DST Rule |
| All | Australia/Melbourne | +10:00 | Australia |
Australia – Western Australia
| Area | Time Zone | Offset | DST Rule |
| All, except Eucla area | Australia/Darwin | +8:00 | none |
| Eucla, Mundrabilla, and Madura | Australia/Eucla | +8:45 | none |
Azerbaijan
| Area | Time Zone | Offset | DST Rule |
| All full history | Asia/Baku | +4:00 | none |
Bahamas
| Area | Time Zone | Offset | DST Rule |
| All full history | America/Nassau | -5:00 | North America |
Bermuda
| Area | Time Zone | Offset | DST Rule |
| All full history | Atlantic/Bermuda | -4:00 | North America |
Canada – Alberta
| Area | Time Zone | Offset | DST Rule |
| All | America/Edmonton | -7:00 | North America / Canada |
Canada – British Columbia
| Area | Time Zone | Offset | DST Rule |
| Vancouver & All (except Creston, Dawson Creek, and Fort Nelson areas) full history | America/Vancouver | -7:00 | none |
| Creston, Yahk, Kuskonook | America/Creston | -7:00 | none |
| Dawson Creek, Fort Saint John, Tumbler Ridge, Chetwynd, Moberly Lake | America/Dawson_Creek | -7:00 | none |
| Fort Nelson, Summit Lake | America/Fort_Nelson | -7:00 | North America / Canada |
Canada – Manitoba
| Area | Time Zone | Offset | DST Rule |
| All | America/Winnipeg | -6:00 | North America / Canada |
Canada – New Brunswick
| Area | Time Zone | Offset | DST Rule |
| All | America/Moncton | -4:00 | North America / Canada |
Canada – Newfoundland & Labrador
| Area | Time Zone | Offset | DST Rule |
| Island of Newfoundland, and Forteau to Comfort Bight | America/St_Johns | -3:30 | North America / Canada |
| Happy Valley-Goose Bay to Cartwright, and north | America/Goose_Bay | -4:00 | North America / Canada |
Canada – Northwest Territories
| Area | Time Zone | Offset | DST Rule |
| Yellowknife | America/Yellowknife | -7:00 | North America / Canada |
| Inuvik | America/Inuvik | -7:00 | North America / Canada |
Canada – Nova Scotia & Prince Edward Island
| Area | Time Zone | Offset | DST Rule |
| Nova Scotia - All (except Sydney and surrounding areas) | America/Halifax | -4:00 | North America / Canada |
| Nova Scotia - Sydney, Glace Bay, Eskasoni, Fourchu, Louisbourg, Alder Point, Hillside Boularderie | America/Glace_Bay | -4:00 | North America / Canada |
| Prince Edward Island - All | America/Halifax | -4:00 | North America / Canada |
Canada – Nunavut
| Area | Time Zone | Offset | DST Rule |
| Pangnirtung | America/Pangnirtung | -5:00 | North America / Canada |
| Iqaluit, Sanikiluaq, Cape Dorset, Kimmirut, Clyde River, Pond Inlet, Hall Beach, Igloolik | America/Iqaluit | -5:00 | North America / Canada |
| Resolute | America/Resolute | -6:00 | North America / Canada |
| Rankin Inlet, Arviat, Baker Lake, Qamanituaq, Repulse Bay, Chesterfield Inlet, Gjoa Haven, Arctic Bay, Whale Cove, Eureka | America/Rankin_Inlet | -6:00 | North America / Canada |
| Cambridge Bay, Kugluktuk, Coppermine, Kugaaruk, Pelly Bay, Arviligjuaq, Bathurst Inlet, Umingmaktok, Taloyoak | America/Cambridge_Bay | -7:00 | North America / Canada |
Canada – Ontario
| Area | Time Zone | Offset | DST Rule |
| Central and Southern - Toronto, Ottawa, Kingston, London, Sudbury, Timmins | America/Toronto | -5:00 | North America / Canada |
| Sault Ste. Marie | America/Detroit | -5:00 | North America / US |
| Thunder Bay | America/Thunder_Bay | -5:00 | North America / Canada |
| Nipigon, Red Rock | America/Nipigon | -5:00 | North America / Canada |
| Atikokan, Quetico Provincial Park | America/Atikokan | -5:00 | none |
| Western - Dryden, Ear Falls, Ignace, Kenora, Morley, Morson, Perrault Falls, Red Lake, Sioux Lookout, Sioux Narrows, Slate Falls | America/Winnipeg | -6:00 | North America / Canada |
| Rainy River | America/Rainy_River | -6:00 | North America / Canada |
| Barwick, Emo, Fort Frances | America/Chicago | -6:00 | North America / US |
Canada – Québec
| Area | Time Zone | Offset | DST Rule |
| All (except Blanc-Sablon to Musquaro) - Montreal, Québec City, Sherbrooke, Trois-Rivières | America/Toronto | -5:00 | North America / Canada |
| Blanc-Sablon to Musquaro (approx. 61° 6′ W) | America/Blanc-Sablon | -4:00 | none |
Canada – Saskatchewan
| Area | Time Zone | Offset | DST Rule |
| All (except Swift Current and Lloydminster areas) | America/Regina | -6:00 | none |
| Swift Current (not used since 1972) | America/Swift_Current | -6:00 | none |
| Lloydminster and surrounding towns - Marshall, Lashburn, Waseca, Maidstone, Paynton, Marsden, Neilburg | America/Edmonton | -7:00 | North America / Canada |
Canada – Yukon
| Area | Time Zone | Offset | DST Rule |
| All, except Dawson area full history | America/Whitehorse | -7:00 | none |
| Dawson full history | America/Dawson | -7:00 | none |
China
| Province | Time Zone | Offset | DST Rule |
| All provinces (except Xinjiang) | Asia/Shanghai | +8:00 | none |
| Xinjiang province (+6 may be used locally) | Asia/Urumqi | +6:00 | none |
Eswatini (Swaziland)
| Area | Time Zone | Offset | DST Rule |
| All | Africa/Mbabane | +2:00 | none |
Europe – Western
| Country | Time Zone | Offset | DST Rule |
| England (UK) | Europe/London | 0:00 |
Europe |
| Guernsey | Europe/Guernsey | ||
| Ireland | Europe/Dublin | ||
| Isle of Man | Europe/Isle_of_Man | ||
| Jersey | Europe/Jersey | ||
| Northern Ireland (UK) | Europe/London | ||
| Portugal | Europe/Lisbon | ||
| Scotland (UK) | Europe/London | ||
| Wales (UK) | Europe/London |
Europe – Central
| Country / City-state / Municipality | Time Zone | Offset | DST Rule |
| Andorra | Europe/Andorra | +1:00 |
Europe |
| Austria | Europe/Vienna | ||
| Belgium | Europe/Brussels | ||
| Czech Republic | Europe/Prague | ||
| Denmark | Europe/Copenhagen | ||
| Finland - All (except Åland Isls.) | Europe/Helsinki | ||
| Finland - Åland Islands | Europe/Mariehamn | ||
| France | Europe/Paris | ||
| Germany - All (except Busingen) | Europe/Berlin | ||
| Germany - Busingen | Europe/Busingen | ||
| Gibraltar | Europe/Gibraltar | ||
| Italy | Europe/Rome | ||
| Luxembourg | Europe/Luxembourg | ||
| Malta | Europe/Malta | ||
| Monaco | Europe/Monaco | ||
| Netherlands | Europe/Amsterdam | ||
| Norway | Europe/Oslo | ||
| San Marino | Europe/San_Marino | ||
| Spain | Europe/Madrid | ||
| Sweden | Europe/Stockholm | ||
| Switzerland | Europe/Zurich | ||
| Vatican City State | Europe/Vatican |
Europe – Eastern
| Country / City-state / Municipality | Time Zone | Offset | DST Rule |
| Albania | Europe/Tirane | +2:00 |
Europe |
| Bulgaria | Europe/Sofia | ||
| Estonia | Europe/Tallinn | ||
| Greece | Europe/Athens | ||
| Latvia | Europe/Riga | ||
| Lithuania | Europe/Vilnius |
Israel
| Area | Time Zone | Offset | DST Rule |
| All | Asia/Jerusalem | +2:00 | Israel |
Japan
| Area | Time Zone | Offset | DST Rule |
| All | Asia/Tokyo | +9:00 | none |
Jordan
| Area | Time Zone | Offset | DST Rule |
| All full history | Asia/Amman | +3:00 | none |
Lesotho
| Area | Time Zone | Offset | DST Rule |
| All | Africa/Maseru | +2:00 | none |
Libya
| Area | Time Zone | Offset | DST Rule |
| All full history | Africa/Tripoli | +2:00 | none |
Mexico
Mexico stopped observing daylight saving time nationwide after 30 October 2022, when the Ley de los Husos Horarios took effect. The municipalities along the U.S. border are exempt and still follow the North America DST rule.
| Area | Time Zone | Offset | DST Rule |
| Mexico City & Central Mexican States full history | America/Mexico_City | -6:00 | none |
| Quintana Roo full history | America/Cancun | -5:00 | none |
| Campeche & Yucatán full history | America/Merida | -6:00 | none |
| Tamaulipas, Nuevo León & Coahuila (near the U.S. border) full history | America/Matamoros | -6:00 | North America |
| Durango (all) – Tamaulipas, Nuevo León, Coahuila (away from the U.S. border) full history | America/Monterrey | -6:00 | none |
| Chihuahua (near the U.S. border) full history | America/Ojinaga | -6:00 | North America |
| Chihuahua (away from the U.S. border) full history | America/Chihuahua | -6:00 | none |
| Sonora full history | America/Hermosillo | -7:00 | none |
| Baja California Sur, Nayarit & Sinaloa full history | America/Mazatlan | -7:00 | none |
| Muni. of Bahia Banderas, Nayarit full history | America/Bahia_Banderas | -6:00 | none |
| Tijuana & Baja California full history | America/Tijuana | -8:00 | North America |
New Zealand
| Area | Time Zone | Offset | DST Rule |
| All, except Chatham Islands | Pacific/Auckland | +12:00 | New Zealand |
| Chatham Islands | Pacific/Chatham | +12:45 | New Zealand |
North Korea
| Area | Time Zone | Offset | DST Rule |
| All full history | Asia/Pyongyang | +9:00 | none |
Palestine
| Area | Time Zone | Offset | DST Rule |
| Gaza Strip full history | Asia/Gaza | +2:00 | Palestine |
| West Bank full history | Asia/Hebron | +2:00 | Palestine |
São Tomé and Príncipe
| Area | Time Zone | Offset | DST Rule |
| All full history | Africa/Sao_Tome | 0:00 | none |
South Africa
| Area | Time Zone | Offset | DST Rule |
| All | Africa/Johannesburg | +2:00 | none |
South Korea
| Area | Time Zone | Offset | DST Rule |
| All full history | Asia/Seoul | +9:00 | South Korea |
Turks & Caicos
| Area | Time Zone | Offset | DST Rule |
| All full history | America/Grand_Turk | -5:00 | North America |
USA – Eastern
| States (or portion of) / Areas | Time Zone | Offset | DST Rule |
| Connecticut, Delaware, Georgia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, South Carolina, Vermont, Virginia, Washington D.C., and West Virginia | America/New_York | -5:00 | North America / US |
| Florida (main peninsula & eastern panhandle) – Tallahassee, Miami, Orlando, Tampa, Jacksonville, Daytona Beach, West Palm Beach, Naples, Ft. Lauderdale, Key West | America/New_York | -5:00 | North America / US |
| Tennessee (eastern) – Knoxville, Pigeon Forge, Johnson City, Kingsport – these cities and east: Chattanooga, Dayton, Spring City, Oak Ridge, and Oneida | America/New_York | -5:00 | North America / US |
| Kentucky – Louisville | America/Kentucky/ Louisville |
-5:00 | North America |
| Kentucky (eastern) – Lexington, Frankfort – these cities and east: Pine Knot, Burnside, Nancy, Dunnville, Campbellsville, Fort Knox | America/New_York | -5:00 | North America / US |
| Michigan (most, except for Dickinson, Gogebic, Iron, and Menominee counties) – Detroit, Grand Rapids, Ann Arbor, Lansing, Kalamazoo, Mackinac Island, Marquette | America/Detroit | -5:00 | North America / US / Detroit |
USA – Central
| States (or portion of) / Areas | Time Zone | Offset | DST Rule |
| Florida (western panhandle) – Pensacola, Panama City – these cities and west: Mexico Beach, Wewahitchka, Marysville, Blountstown, and Sneads | America/Chicago | -6:00 | North America / US |
| Tennessee (western) – Nashville, Memphis, Jackson – these cities and west: Jasper, Dunlap, Pikeville, Crosstown, and Jamestown | America/Chicago | -6:00 | North America / US |
| Kentucky – Monticello | America/Kentucky/ Monticello |
-6:00 | North America |
| Michigan (southwestern upper peninsula) – counties of Dickinson, Gogebic, Iron, and Menominee – Menominee, Iron Mountain, Watersmeet, Ironwood, Iron River, Crystal Falls | America/Menominee | -6:00 | North America / US / Menominee |
| Texas – All (except far western) – Austin, Houston, Dallas, Ft. Worth, San Antonio, Arlington, Corpus Christi, Plano, Amarillo, Lubbock, Brownsville, Laredo, Beaumont, Van Horn | America/Chicago | -6:00 | North America / US |
| Indiana – Starke county – Knox, Koontz Lake, Hamlet, Grovertown, San Pierre, North Judson, Bass Lake | America/Indiana/Knox | -6:00 | North America / US |
| North Dakota - Center | America/North_Dakota/ Center |
-6:00 | North America / US |
| North Dakota - New Salem | America/North_Dakota/ New_Salem |
-6:00 | North America / US |
| North Dakota - Beulah | America/North_Dakota/ Beulah |
-6:00 | North America / US |
USA – Mountain
| States (or portion of) / Areas | Time Zone | Offset | DST Rule |
| Colorado, Montana, New Mexico, Utah, Wyoming | America/Denver | -7:00 | North America / US |
| Texas – far western – El Paso, Socorro, Fort Hancock, Sierra Blanca, Allamoore, Anthony, Cornudas, Dell City | America/Denver | -7:00 | North America / US |
| Arizona - All (except Navajo Nation) - Phoenix, Tucson, Scottsdale, Prescott, Flagstaff, Hopi Reservation, Grand Canyon National Park | America/Phoenix | -7:00 | none |
| Navajo Nation – northeastern Arizona, southeastern Utah, and northwestern New Mexico | America/Denver | -7:00 | North America / US |
| Idaho – (southern) – Boise, Twin Falls, Pocatello, Idaho Falls, Nampa, Sun Valley, Cascade, McCall, Salmon – these cities and south: Riggins, North Fork, and Gibbonsville | America/Boise | -7:00 | North America / US |
| Oregon – Malheur County (most) | America/Boise | -7:00 | North America / US |
| Nevada – Jackpot | America/Boise | -7:00 | North America / US |
| Nevada – West Wendover | America/Denver | -7:00 | North America / US |
USA – Pacific
| States (or portion of) / Areas | Time Zone | Offset | DST Rule |
| California, Washington, and Oregon (except Malheur County) | America/Los_Angeles | -8:00 | North America / US |
| Nevada – All (except Jackpot & West Wendover) | America/Los_Angeles | -8:00 | North America / US |
| Idaho – (northern) – Grangeville, Lewiston, Moscow, Coeur d'Alene, Sandpoint, Bonners Ferry – these cities and north: White Bird, Elk City, Red River Hot Springs, and Upper Crossing | America/Los_Angeles | -8:00 | North America / US |
USA – Alaska
| Portion or area of Alaska | Time Zone | Offset | DST Rule |
| Anchorage | America/Anchorage | -9:00 | North America / US |
| Juneau | America/Juneau | -9:00 | North America / US |
| Sitka | America/Sitka | -9:00 | North America / US |
| Metlakatla | America/Metlakatla | -9:00 | North America / US |
| Nome | America/Nome | -9:00 | North America / US |
| Yakutat | America/Yakutat | -9:00 | North America / US |
| Adak – western Aleutian Islands – Chuginadak Island and west | America/Adak | -10:00 | North America / US |
USA – Hawaii
| State | Time Zone | Offset | DST Rule |
| Hawaii - All | Pacific/Honolulu | -10:00 | none |
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